Biomechanical comparison of canine femurs implanted with either cemented (CFX ® ) or cementless (with lateral bolt) (BFX ® +lb) total hip replacement under 4-point bending or torsional loads.
| Autor: | Tinga S; Comparative Orthopaedics and Biomechanics Laboratory, College of Veterinary Medicine, University of Florida, Gainesville, FL, United States., Tuyn DD; Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, United States., Kopp RJ; Comparative Orthopaedics and Biomechanics Laboratory, College of Veterinary Medicine, University of Florida, Gainesville, FL, United States., Kim SE; Comparative Orthopaedics and Biomechanics Laboratory, College of Veterinary Medicine, University of Florida, Gainesville, FL, United States. |
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| Jazyk: | angličtina |
| Zdroj: | Frontiers in bioengineering and biotechnology [Front Bioeng Biotechnol] 2023 Mar 08; Vol. 11, pp. 999271. Date of Electronic Publication: 2023 Mar 08 (Print Publication: 2023). |
| DOI: | 10.3389/fbioe.2023.999271 |
| Abstrakt: | Objective: Compare biomechanical properties of femurs implanted with either BioMedtrix ™ biological fixation with interlocking lateral bolt (BFX ® +lb) or cemented (CFX ® ) stems when subjected to 4-point bending or axial torsional forces. Study Design: Twelve pairs of normal medium to large cadaveric canine femora were implanted with a BFX + lb ( n = 12) and a CFX ( n = 12) stem-one in the right and one in the left femora of the pair. Pre- and post-operative radiographs were made. Femora were tested to failure in either 4-point bending ( n = 6 pairs) or axial torsion ( n = 6 pairs), and stiffness, load or torque at failure, linear or angular displacement, and fracture configuration were noted. Results: Implant position was acceptable in all included femora, but CFX stems were placed in less anteversion than BFX + lb stems in the 4-point bending group (median (range) 5.8 (-1.9-16.3) vs. 15.9 (8.4-27.9) anteversion, respectively ( p = 0.04)). CFX implanted femora were more stiff than BFX + lb implanted femora in axial torsion (median (range) 2,387 (1,659-3,068) vs. 1,192 (795-2,150) N*mm/ o , respectively ( p = 0.03)). One of each stem type, from different pairs, did not fail in axial torsion. There was no difference in stiffness or load to failure in 4-point bending, or in fracture configuration for either test, between implant groups. Conclusion: Increased stiffness of CFX implanted femurs under axial torsional forces may not be clinically relevant as both groups withstood expected in vivo forces. Based on this acute post-operative model using isolated forces, BFX + lb stems may be a suitable replacement for CFX stems in femurs with normal morphology (stovepipe and champagne flute morphology were not tested). Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2023 Tinga, Tuyn, Kopp and Kim.) |
| Databáze: | MEDLINE |
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